用于火花计数的膜,要求厚度比较薄(10～25μm)而均匀,但国内外商业上出售的膜难以满足要求。为此我们参考了国内外有关膜的制备流程,制定出了一个采用丙酮为主要溶剂、毒性小、成本低、取材于国内的流程。膜的均匀度在面积5×5cm~2内为10～25±2μm,在3000计数/cm~2内火花计数对α计数的响应是线性的。 The film used for spark counting requires a relatively thin thickness (10 to 25 μm) and uniform, but commercially available films at home and abroad are difficult to meet the requirements. For this reason, we have made reference to the domestic and foreign membrane preparation process, developed a process using acetone as the main solvent, low toxicity, low cost, drawn from the country. The uniformity of the film is 10 ~ 25 ± 2μm within the area of ​​5 × 5cm ~ 2. The response of the spark count to the α count is linear at 3000 counts / cm ~ 2.